tree 5a03eb58d15d7b452cb65251b0a85e7adada68f0
parent e7037bd9fc07329f8a2e6383c65876a35ba33a12
author Marc Zyngier <marc.zyngier@arm.com> 1532080585 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1532262461 +0200

arm64: Add 'ssbd' command-line option

commit a43ae4dfe56a01f5b98ba0cb2f784b6a43bafcc6 upstream.

On a system where the firmware implements ARCH_WORKAROUND_2,
it may be useful to either permanently enable or disable the
workaround for cases where the user decides that they'd rather
not get a trap overhead, and keep the mitigation permanently
on or off instead of switching it on exception entry/exit.

In any case, default to the mitigation being enabled.

Reviewed-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>